ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,878, issued on June 17, was assigned to Zhejiang Suoli Industry and Trade Co. Ltd. (Lishui, China).
"Electric double-rod grease gun" was invented by Liping Li (Yongkang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electric double-rod grease gun is provided, which includes an oil storage tank, a plunger pump, and a driving device; the plunger pump includes a pump body that is provided with a first plunger chamber and a second plunger chamber, both the first plunger chamber and second plunger chamber are respectively provided with a first plunger rod and a second plunger rod; the driving device includes a driving motor, a reduction mechani...